Study on the local heat transfer behaviour in a flat plate pulsating heat pipe

Abstract A closed-loop Flat Plate Pulsating Heat Pipe, filled with a water-ethanol mixture (filling ratio = 50% vol.), is tested in horizontal orientation at different heat loads to assess local wall-to-fluid fluxes exchanged within its adiabatic section. In addition, the thermal interactions between adjacent channels are investigated since they could be responsible for poorer performances such kinds of cooling systems. The studied device obtained from copper plate (width: 80 mm, length: 200 thickness: 3.5 mm) machined single square shaped groove (3 x 3 mm 2 ) forming series 8 turns evaporator zone and covered second having same length width, thickness equal 0.5 mm. During Pipe operation, temperature external wall, coated high-emissivity paint, monitored whole section by an InfraRed camera during pseudo-steady state. thermographic measurements post-processed adopting Inverse Conduction Problem resolution approach, adequately validated numerical simulations. resulting terms amplitude oscillation, thus providing novel pieces information regarding working behaviour Pipes oscillatory flow conduction channels.